gistfile1.txt

<background>
  <starttime>
    <year>2023</year>
    <month>09</month>
    <day>01</day>
    <hour>8</hour>
    <minute>00</minute>
    <second>00</second>
  </starttime>
<!-- This animation will start at 8 AM. -->

<!-- We start with day at 8 AM. It will remain up for 10 hours. -->
<static>
<duration>36000.0</duration>
<file>/usr/share/backgrounds/f39/default/f39-01-day.png</file>
</static>

<!-- Day ended and starts to transition to night at 6 PM. The transition lasts for 2 hours, ending at 8 PM. -->
<transition type="overlay">
<duration>7200.0</duration>
<from>/usr/share/backgrounds/f39/default/f39-01-day.png</from>
<to>/usr/share/backgrounds/f39/default/f39-01-night.png</to>
</transition>

<!-- It's 8 PM, we're showing the night till 6 AM. -->
<static>
<duration>36000.0</duration>
<file>/usr/share/backgrounds/f39/default/f39-01-night.png</file>
</static>

<!-- It's 6 AM, and we're starting to transition to day. Transition completes at 8 AM. -->
<transition type="overlay">
<duration>7200.0</duration>
<from>/usr/share/backgrounds/f39/default/f39-01-night.png</from>
<to>/usr/share/backgrounds/f39/default/f39-01-day.png</to>
</transition>

</background>